Connected: An Internet Encyclopedia
RFC 1945 - 7.1 Entity Header Fields

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### 7.1 Entity Header Fields

Entity-Header fields define optional metainformation about the Entity-Body or, if no body is present, about the resource identified by the request.

           Entity-Header  = Allow                    ; Section 10.1
                          | Content-Encoding         ; Section 10.3
                          | Content-Length           ; Section 10.4
                          | Content-Type             ; Section 10.5
                          | Expires                  ; Section 10.7
                          | Last-Modified            ; Section 10.10
                          | extension-header

           extension-header = HTTP-header

The extension-header mechanism allows additional Entity-Header fields to be defined without changing the protocol, but these fields cannot be assumed to be recognizable by the recipient. Unrecognized header fields should be ignored by the recipient and forwarded by proxies.

Next: 7.2 Entity Body

Connected: An Internet Encyclopedia
RFC 1945 - 7.1 Entity Header Fields